EnantioselectiveAldol Reaction Between Isatins and Cyclohexanone Catalyzed by Amino Acid Sulphonamides
作者:Jun Wang、Qi Liu、Qing Hao、Yanhua Sun、Yiming Luo、Hua Yang
DOI:10.1002/chir.22433
日期:2015.4
Sulphonamides derived from primary α‐aminoacid were successfully applied to catalyze the aldolreaction between isatin and cyclohexanone under neat conditions. More interestingly, molecular sieves, as privileged additives, were found to play a vital role in achieving high enantioselectivity. Consequently, high yields (up to 99%) along with good enantioselectivities (up to 92% ee) and diastereoselectivities
Primary 1,2-Diamine Catalysis (V): Efficient Asymmetric Aldol Reactions of Isatins with Cyclohexanone
作者:Qi Sun、Runtao Li、Yi Liu、Pengchao Gao、Junfeng Wang、Zemei Ge
DOI:10.1055/s-0031-1290507
日期:2012.4
1,2-Diaminocyclohexane-hexanedioic acid has been demonstrated to catalyze the asymmetric aldol reactions of cycloketones and various isatin derivatives efficiently in MeOH-H2O. The corresponding products were obtained in good yields (70-90%) with high diastereoselectivity (up to 99:1 anti/syn) and enantioselectivity (up to 99% ee).